Exp 17 help - both pre and post lab, using Excel

[Robert Zellmer]

This is a reminder to look at my help files for exp 17.  I have both 
pre-lab
and post-lab hints and help.

There is both a pre-lab and post-lab on Carmen for exp 17.

Please look at the pre-lab help before going  to lab.  You are making four
solutions by mixing Cr^3+ and EDTA- resulting in different conc. of Cr^3+
in each solution.  You want a SINGLE table for the time and absorbance
data for the four solutions on a single page.  You should have a table with
8 columns, in groups of two for each solution, marked something like

soln 1 	
	soln 2
	
	soln 3 	
	soln 4 	
time (min)
	Abs
	time (min) 	Abs 	time (min) 	Abs
	time (min) 	Abs

	
	
	
	
	
	
	


This table should be big enough to record at least 15 lines of time and 
Abs data.

You will also need to have space for recording the initial conc. of the 
Cr^3+ in
each soln. and the absorbance values for the product in the boiled 
solutions.


*Laboratory* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/lab/lab_1220.htm> (see 
stuff dealing with exp 17)

*Pre and Post-lab Help for Exp 17 - (Answers to Students' Questions)* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/faq/exp17_help.txt>

*Handout for Exp. 17 - Report Tips (Data Analysis)* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/lab/exp17_tips.pdf>

I HIGHLY suggest you use Excel (or something similar) to do the data 
tables, calculations and graphs.

*Exp 17 - Using MS Excel* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/lab/exp17/exp17.htm>

There are a lot of calculations (a minimum of 245).  If you make a 
mistake you often don't realize
it until you do graph 2 (zero-order plot).  Then you have to go back and 
redo all the calculations.
Using Excel makes the whole process easier, even if you don't make a 
mistake.

Dr. Zellmer
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